Pipe-wrench



(Model.)

B. P. OHAPPELL.

PIPE WRENCH.

No. 385,695. Patented July 3, 1888.

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UNITED STATES PATENT OFFICE.

BENJAMIN F. CHAPPELL, OF SOUTH XVINDHAM, CONNECTICUT.

PlPE W'RENOl-l.

SPECIFICATION forming part of Letters Patent No. 385,595, dated July 3, 1888.

Application filed October 14, 1886. Serial No. 216,213. (Model) To aZZ whom it may concern:

Be it known that I, BENJAMIN F. CHAP- PELL, of South WVindham, Windham county, Connecticut, have invented a certain new and useful Improvementin Pipe-Wrenches, which improvement is fully described in the follow ing specification, reference being had to the accompanying sheet of drawings, in which- Figure l is a side view of a wrench of my new construction. Fig. 2 represents a crosssection of the same on line a: x, and Fig. 3 is a detached view of the movable jaw d. Fig. 4. is a sectional view more clearly illustrating my improvement.

My invention is in that class of pipe wrenches'which have a movable jaw-section adapted to jam against the pipe when in use, and my object is to produce in a cheap rnanner a wrench of great strength and gripping power.

Referring to the drawings, the letter a indicates a handle of suitable length having an integral head section formed as two jaws, b c, the former of which is channeled or recessed from its inner side to receive aserrated jaw, d. This recess presents interiorly a concave bearing, f, extending from a beak-point, t, backward and terminating in an enlarged throat, 9, having a concave wall, 71,. The inner edge of the beak c is flat and forms an abutment for a pipe while being clenched and turned. The back f of the jaw d has an arc conforming to the bearingf, on which thejaw is allowed to slide, whose serrated side confronts the inner wall of jaw c. Thisjaw d is not fixed in section b, but is free to move longitudinally a certain distance. The general shape of jaw d, when viewed sidewise, as in Fig. 3, is that of a wedge, and the bottom of the channel provided to receive it should be of the same shape as the engaging-edge of said jaw, so that when the said jaw is moved outward in its slot the serrated edge is moved toward the jaw c and wedged against the pipe with a tendency to hold it with a grip proportionate to the power exerted by the workman.

By forming the bottom wall of the channel in section b to fit the engaging-edge of the sliding jaw a long bearing is provided which holds the jaw up to its work with no possibit ity of its deflecting, springing, or slipping. The side walls of the channel give strength to section b and prevent jaw d from moving sidewise.

Topreventjaw d from dropping out ofplace, I have drilled and tapped the wrench-head and inserted a screw, (2, having a spur which extends into a slot in said jaw, said slot being large enough so that no strain comes on the screw.

I am aware that a serrated jaw adapted to move at a right angle to the handle to hold a pipe in engagement with a rigid hook-shaped jaw has been used; also that a movable serrated jaw has been used in wrenches having a sliding head which carries said serrated jaw, and therefore do not seek to secure to myself the unrestricted use of a serrated jaw.

I am aware that it is not new to provide a wrench with a sliding serrated wedge shaped jaw at the base of a hook; but I am not aware that any one has ever provideda wrench with a curved slot in one jaw, opposite to which is a flat-faced jaw, and placed a curved serrated wedge in the slotted jaw.

hat I do claim is-- 1. The improved pipe-wrench herein described, consisting of a handle having two jaws formed on it, the upper jaw having a recess presenting a long curved bearing, f..

and a threat, 9, the serrated curved wedge (Z. grooved and titted loosely in said recess, and the pin 6, for the purpose described, in combination with the flat-faced jaw c, all con structed and adapted to operate substantially as described.

2. A pipe-wrench having a recessed upper jaw throated, as described, in combination with a curved wedge portion having teeth pitched toward the handle and loosely held in the recess of said upper jaw.

3. The combination, with a bill month wrench, of a slip jaw having teeth backwardly pitched and grooved, as described, and a pin connecting thisjaw to the upper integral bill of the wrench.

' BENJAMIN F. CHAPPELL.

Vitnesses:

FRANK H. ALLEN,

TYLER J. HOWARD. 

